Is anyone else like this?

So my period was a week late and I was very nauseous and my boobs were incredibly tender. I counted back to when I would have ovulated and find that there is a very real chance that I'm pregnant. (My period has always been irregular, but after my doctor told me to stop taking bc my periods came exactly 4 weeks apart on the dot) I never feel nauseous for no reason and two days prior I had some spotting that looked like implantation bleeding, so I was SURE I was pregnant. My boyfriend got me a couple pregnancy tests and I took one immediately and it came back negative. The next morning I'm covered in blood. Does this happen to anyone else? Every time my period is more than a week late and I think I'm pregnant but get a negative test result, I start bleeding the very next day.